Your choice of glues depends on the materials being glued and also
the nature of the joint.

That said, for epoxies, the most archival is called Hxtal. It is the
glue of choice for most glass artists. It has a very slow setting
time and can take a week to acheive full cure. It’s a demanding glue
must be dealt with accurately, but when you do, the results can’t be
beat.

I use Epoxy 330. It is a two-part epoxy supplied in “travel size
toothpaste” type tubes. You just mix equal amounts from each tube
and apply. It is relatively fast-drying. I use it primarily for
gluing pearls, but have used it for a lot of other applications as
well. It is available from all jewelry supply houses.